Serrated flow and tensile properties of a Mg-Gd-Zn alloy

IMR OpenIR

	Serrated flow and tensile properties of a Mg-Gd-Zn alloy
	D. Wu; R. S. Chen; E. H. Han
	2012
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	532 页码:267-274
摘要	The tensile deformation behavior of Mg-3Gd-Zn (wt.%) alloy sheets annealed and aged at different temperatures has been studied. Samples annealed at 400 degrees C for 1 h exhibit serrated flow when they are tensile tested at temperatures ranging from 150 degrees C to 250 degrees C and at strain rates of 1 x 10(-4) s(-1) to 1 x 10(-2) s(-1). The critical strain for onset of the serrated flow is observed to increase with increasing strain rate but decrease with increasing temperature. The temperature dependences of yield strength and ultimate strength exhibit a plateau, and the expected ductility dips are also observed in the temperature regime of serrated flow. For samples annealed at 480 degrees C for 1 h, the precipitates and serration both disappear. However, subsequent aging treatments result in the reappearance of a large amount of precipitates and the serration phenomenon, proving that the serrated flow in the Mg-3Gd-Zn sheets is mainly controlled by the shearing of precipitates by gliding dislocations. In addition, the observed static strain aging effect, the negative strain rate sensitivity and the calculated activation energy, combined with observations made by scanning electron microscopy, suggest that dynamic strain aging may also contribute to the serrations in the present alloy. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.
部门归属	[wu, d.; chen, r. s.; han, e. h.] chinese acad sci, inst met res, state key lab corros & protect, shenyang 110016, peoples r china. [wu, d.] chinese acad sci, grad univ, beijing 100049, peoples r china.;chen, rs (reprint author), chinese acad sci, inst met res, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china.;rschen@imr.ac.cn
关键词	Magnesium Alloys Portevin-le Chatelier Effect Shearing Of Precipitates Dynamic Strain Aging Tensile Properties Grain-size Mechanical-properties Single-crystals Thorium Alloy Strain-rate Magnesium Texture Ductility Yield Behavior
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/60338
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	D. Wu,R. S. Chen,E. H. Han. Serrated flow and tensile properties of a Mg-Gd-Zn alloy[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2012,532:267-274.
APA	D. Wu,R. S. Chen,&E. H. Han.(2012).Serrated flow and tensile properties of a Mg-Gd-Zn alloy.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,532,267-274.
MLA	D. Wu,et al."Serrated flow and tensile properties of a Mg-Gd-Zn alloy".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 532(2012):267-274.